/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

new Promise((resolve, reject) => {
	setTimeout(() => {
		resolve(['hello'])
	}, 10)
}).then((res) => {
	console.log(res)
	return new Promise((resolve, reject) => {
		setTimeout(() => {
			resolve([...res, "lagou"])
		}, 10)
	})
}).then((res) => {
	console.log(res)
	return new Promise((resolve, reject) => {
		setTimeout(() => {
			resolve([...res, "'I ♥ U'"])
		}, 10)
	})
}).then((res) => {
	let [a, b, c] = res;
	console.log(res)
	console.log(a + b + c)
})
